You first need to add Dropbox to Files app in iPhone. (https://help.dropbox.com/installs-integrations/mobile/ios-files-app)
And the you can click `Choose a File` option to attach files from Files App that contains Dropbox folder to Trello.
@DPK Jis right about the Dropbox app connecting to the files app but that is not using the powerup.
In regards to the powerup itself, I'm just putting in my two cents here but after adding the power up and trying this, I am not seeing the option either. I tried looking around to see if anyone confirmed if the power up was available on mobile and I unfortunately couldn't find anything. I also tried with the google drive power up and that wouldn't display on my phone either.
I do know that not all powerups are available on mobile. Unless someone from the Atlassian team can chime in or someone who can give you a solid answer, you can reach out to the Trello support team and they will be able tell you if the powerup is available on mobile.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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